Safety journal-box.



W. N. TANNER.

SAFETY JOURNAL BOX.

APPLICATION FILED NOV.1,1905.

Patented June 1,1909.

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UNITED STATES PATENT OFFICE.

WALLACE N. TANNER, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-OHALMERS GOM- PANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

SAFETY JOURNAL-BOX.

To all whom it may concern:

Be it known that I, WALLACE N. TANNER, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Safety Journal-Boxes, of which the following is a specification.

This invention relates to a structure which under normal conditions of use is maintained in position, but when subjected to unusual load or strain is adapted to yield. This yielding may occur through the break ing of an easily replaceable inexpensive element or elements.

This invention has especial utility when applied to rigid roll crushing machines wherein it is desirable to break a rock down to a certain size, and while so operating to prevent entire wreckage of the machine due to excessive strain should something unusually hard get into the mill.

An embodiment of the device is shown in the drawings herewith, in which,-

Figure 1 is a plan view; Fig. 2 is an end view; Fig. 3 is an enlarged detail plan view of the yieldable portion; and Fig. 4 is a side view of the same detail.

The base 1 has at each side thereof clovetail guides 2 on which are mounted to slide the adjustable journal boxes 3. Extending through the journal boxes is a shaft 4 carrying the crushing roll 5. Bolted to the journal boxes 3 is a one-piece member or yoke 6 having recess 61 intermediate its ends. In this recess is a block or cross-head 7 secured to the yoke 6 by the bolts 8. Engaging this block 7 and the frame 1 is an adjusting device 9 which serves to vary the Specification of Letters Patent.

Application filed November 1, 1905.

Patented June I, 1909.

Serial No. 285,416.

position of the journal boxes, moving each equally. This adjusting device serves nor mally to hold the yoke and boxes in adjusted position. This single adjusting means for both boxes, which are kept parallel by the guides, is a very advantageous structure. The yoke, before breaking away from the adjusting device, holds the journal boxes in position. When the crushing roll 5 is strained in a direction tending to move the boxes 3 on the base 1 and when this strain becomes abnormal, the bolts 8 are sheared and thus constitute a safety device preventing destruction of other parts.

\Vhat is claimed and it is desired to secure by Letters Patent is:

l. The combination of a pair of boxes, a one-piece yoke connecting the boxes, a base, and adjusting means connecting the yoke to the base and for positioning the yoke thereon and including a part designed to become detached from said yoke on subjecting said boxes to abnormal strain tending to move the boxes on the base.

2. The combination of a plurality of boxes, a base upon which the boxes are movably mounted, a one-piece yoke rigid with the boxes, and rigid means forming a rigid connection between the base and the yoke and including adjusting means and a part designed to become detached from said yoke on subjecting said boxes to abnormal strain tending to move the boxes on the base.

In testimony whereof I affix my signature in presence of two witnesses.

\VALLAOE N. TANNER.

Witnesses:

GRANT B. SHIPLEY, G. F. DE WEIN. 

